package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author OZ.L.XO
 * #Description ShoppingCartSeviceImpl
 * #Date: 2025/7/10 16:39
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        Long userId=BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在了，只需要将数量加一
        if(list!=null && !list.isEmpty()){
            ShoppingCart cart1 = list.get(0);
            cart1.setNumber(cart1.getNumber()+1);
            //update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateNumberById(cart1);
        }else{
            //如果不存在，需要插入一条购物车数据
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加购物车的事菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //本次添加购物车是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getByCategoryId(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list =shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * @Description 删除购物车
     * @Param [shoppingCartDTO]
     * @Return void
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        shoppingCart=list.get(0);
        shoppingCart.setNumber(shoppingCart.getNumber()-1);
        shoppingCartMapper.updateNumberById(shoppingCart);
        if(shoppingCart.getNumber()==0){
            if(shoppingCart.getDishFlavor()!=null){
                shoppingCartMapper.deleteByDishId(shoppingCart.getDishId());
            }else{
                shoppingCartMapper.deleteBySetmealId(shoppingCart.getSetmealId());
            }
        }
    }

    /**
     * 清空购物车
     */
    public void clean() {
        shoppingCartMapper.cleanShoppingCart(BaseContext.getCurrentId());
    }
}
